JPH0527836B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pointer display electronic timepiece equipped with a chronograph function, and more particularly to a zero return mechanism for each chronograph pointer.

[Background of the invention]

The recent development of electronic watches has been remarkable, and in particular, it has become common to add a chronograph (stopwatch) function to digital watches, and they are even becoming popular products. Furthermore, in the market, there is an increasing demand for wristwatches with chronographs as well as pointer display type electronic watches. Against this background, the present invention has been developed to add a chronograph function to an electronic timepiece with a pointer display, which has a small number of parts and is easy to see.
Furthermore, the aim is to develop a structure that is easy to operate and can easily be equipped with functions such as an alarm and a timer.

[Prior art and problems]

Various structures have been tried to add a chronograph mechanism to mechanical watches with pointer display, but in all cases, the return of the chronograph (hereinafter referred to as CG) hour hand, CG minute hand, and CG second hand has been attempted. In the zero structure, a mechanical slip return mechanism consisting of a heart cam or the like is provided on each pointer shaft, and the connection with the hour hand, minute hand, and second hand of the normal time display is separated and controlled by an external operating member.

However, in such a structure, although there is no major problem with the hour hand shaft and minute hand shaft, providing the aforementioned mechanical slip return mechanism on the second hand shaft, which has weak rotational torque, would require parts with strict precision. However, it has the drawbacks of being thicker structurally and increasing cost. Furthermore, recent electronic watches have become smaller in size and thickness, and increasing the torque of the second hand shaft to the same level as mechanical watches requires a correspondingly large amount of energy. A high-capacity battery is required, which increases the size and thickness of the watch, making it extremely unsatisfactory for current electronic watches.

By the way, electronic watches with pointer display that have a chronograph function have recently appeared, but on the other hand, because they are equipped with the mechanical slip-return mechanism mentioned above, they are thick and complicated in size and thickness. On the other hand, in order to avoid this, a watch with an hour hand, a minute hand, and a second hand for normal time is equipped with separate motors, gear trains, etc. for the CG second hand, CG minute hand, and CG hour hand. Furthermore, there has also been announced a system in which an electrical counting circuit is provided in each of the motors so that each motor can be started, stopped, or returned to zero using an electrical signal. But 1
Providing several motors and train wheels, such as a regular time display motor, CG second motor, CG minute motor, and CG hour motor, in a watch not only increases the number of parts, but also makes it difficult to use as a watch part. The number of expensive coils, yokes, and rotors is large, resulting in a very expensive watch.

Further, returning each CG needle to zero using a motor requires a certain amount of time compared to a mechanical slip return mechanism, and it is easier for the user to return to zero as quickly as possible. To speed up this zero return speed, for example, CG
The minute hand moves in 1 minute steps, and the CG hour hand moves in 0.5 to 1 hour steps, making it necessary to reduce the reduction ratio between the motor and the pointer wheel. This is because the current high-speed rotation of watch motors is up to 64 to 128
This is because Hz is the limit. If the CG minute hand were to move in 1-second steps, one rotation of the CG minute hand would amount to 3600 steps, and even if it returned to zero at 64Hz, it would take about 1 minute to move up to 1 hour (one rotation of the CG minute hand). Put it away.

For this reason, if the CG minute hand is moved in 1-minute steps, the CG minute hand will make 60 steps in one rotation, and it will take about 1 second to return to zero for one rotation of the CG minute hand, but under these conditions. When operating CG,
If a very slight deviation occurs due to the deviation of the dial, eccentricity of the car, etc., a reading error of one minute may occur when the user reads the elapsed time.

For example, suppose the elapsed time is 15 minutes and 58 seconds. At this time, suppose that the CG minute hand is 15 minutes above the CG minute scale, and due to the division deviation mentioned above, it is slightly biased towards the 14 minute side from the 15 minute scale. At this time, the user intuitively reads 14 minutes and 58 seconds, resulting in a reading error of 1 minute. This also applies to the CG hour hand. Normally, there is no deviation between the pointer and the cutoff, but there is always a leading direction and a lagging direction in one revolution of the pointer display wheel, and a deviation between the pointer and the cutoff only in the leading direction is something that can never occur. Although it is possible to take measures such as adjusting the needle setting in the direction of movement, it is troublesome and is a problem with large step hand movement displays.

As mentioned above, chronographs with pointer display type electronic watches have various drawbacks, and no one has yet appeared that satisfies users.

[Purpose of the invention]

The present invention solves the above-mentioned drawbacks, and provides a pointer display type electronic timepiece that has a reduced number of parts, is easy for the user to read, and is equipped with a chronograph mechanism that is easy to operate.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below based on the drawings. FIG. 1 is an external plan view of an electronic timepiece with a pointer display type chronograph according to an embodiment of the present invention.

In the figure, 1a and 1b are hour and minute hands that display two times, the normal time and the alarm time, and 2 is the normal time.
CG time 2 is the second hand that displays the seconds of the time, 3 is the CG hour hand that displays the hours of the CG time, and rotates once every 12 hours.
4 is the CG minute hand that displays the minutes of the CG time and rotates once every 60 minutes. 5 is CG2/1 which displays 2/100 seconds of CG time
The 00 second hand makes one revolution in 50 steps per second. Also CG
The 2/100 second hand 5 also displays the remaining time of the timer, and the timer can be set for a maximum of 49 minutes, with each division being 1 minute. 6,
7, 8, 9, 10 are external operation members, 6 is CG
and a button for performing the start/stop function of the timer (hereinafter referred to as the start/stop button), 7 is a button for performing the function of returning the CG to zero and setting the timer (hereinafter referred to as the set/reset button), and 8 is a normal button. The button 9 is used to switch between the time and CG time (hereinafter referred to as the switching button); 9 is a reuse button, and when pulled out two steps and rotated left and right, the time of the hour and minute hands 1a and 1b of the normal time is adjusted; when pulled out one step, the hour and minute hands are adjusted. You can change the display to the alarm time of 1a and 1b and adjust the alarm reference time by rotating left and right. 1
0 is the alarm button to switch the alarm ON/OFF, and when pressed, the alarm will stop sounding.
It is set to wait for the alarm to sound in the pull state. To explain the operation of use, when the reuse 9 is in the 0 step, that is, the pressed position in the normal use state, the hour hand 1a, the minute hand 1b, and the second hand 2 normally indicate the time. When using CG, press the switching button 8 once. Then, the second hand 2 is electrically 64
It is fast forwarded at Hz and returns to the 0 second position to enter chrono mode. There, start/stop button 6
When you press , CG2/100 second hand 5 starts moving in 2/100 second steps. And CG2/100 second hand 5 is 1
Every time the second hand rotates, the second hand 2 moves in 1-second steps as a CG second hand.

Then, as will be described later, the CG minute hand 4 and CG hour hand 3, which are interlocked with the second hand 2 through the gear train, also begin to move in 1-second steps such that they rotate once every 60 minutes and once every 12 hours, respectively. When the timing is finished, press the start/stop button 6 to start each CG hand 2, 3,
4 and 5 stop, so you can know the elapsed time by reading each pointer at that time.

To continue counting the time, by pressing the start/stop button 5 again, the cumulative time can be counted in the same manner as described above. On the other hand, if you want to start counting again from 0 seconds, press the set/reset button 7 while each CG hand is stopped, and the CG hour hand 3 and CG minute hand 4 will instantly return to zero, and the second hand 2 and CG2/100 second hand will return to zero. 5 returns to zero at 64Hz fast forward and waits for the CG to be reused.

In this state, if the start/stop button 6 is pressed to operate the CG, the next time measurement can be performed.

When the use of the CG is completed, press the changeover button 8, and the CG minute hand 4 and CG hour hand 3 will instantly return to zero, and the second hand 4 will be fast-forwarded at a rate of 64Hz to the second display position of the normal time, and from then on The second hand is used to display the seconds of the normal time. Note that this switching to the normal time can be done either while the CG is in operation, that is, while counting time, or even when it is stopped.

Next, in the normal time display state, the timer can be set by pressing the set/reset button 7, and the timer is displayed by the CG2/100 second hand 5. That is, each time the set/reset button 7 is operated, the timer is set in steps of 1 minute, making it possible to set the timer for 49 minutes in total. After setting the timer to a certain time, the timer starts counting by pressing the start/stop button 6, takes one step every minute, and generates an alarm when the timer is up. In addition,
Even if the timer is set, if the start operation is not performed, the CG2/100 second hand 5 will remain stopped.

Furthermore, instead of using the CG2/100 second hand 5 as a timer, by pressing the set/reset button 7 once, it can also be used as a simple 50-decimal counter that counts by one. Also, when the timer performs the start operation,
No matter how much you push the set/reset button 7, new settings are prohibited to prevent the timer from malfunctioning.

Next, when the alarm button 10 is in the pull state and the reuse 9 is pulled out one step, the hour hand 3 and the minute hand 4 switch to the alarm time at a fast forward speed of 128 Hz and display the alarm reference time. In this state, by rotating the reuse 9 in forward and reverse directions, it is possible to set an arbitrary new alarm time. After setting the alarm time, when the reset button 9 is pushed in to return to the normal display state, the hour hand 3 and minute hand 4 switch to display the current time at 64 Hz in reverse. And alarm ON/OFF button 1
If 0 is in the pull state, an alarm sound will be emitted when the reference time is reached, and if it is in the push state, the sound will be stopped, so the alarm sound will not be emitted. In addition, when using the CG or timer, selection is made using the changeover button 8, and operation is performed only using the set/reset button 7 and start/stop button 6, and the alarm is operated using the reset button 9 and alarm button 10, which can be operated independently of each other. Since there are no restrictions on the order of operations, the user can satisfy a wide variety of functions with simple button operations.

FIG. 2 is a block diagram of essential parts of a timepiece system according to an embodiment of the present invention. Reference numeral 12 denotes a reference oscillator composed of a crystal resonator, an oscillation circuit, etc., and its output signal is divided into signals of appropriate frequencies by a frequency divider 13. On the one hand, the output signal from the frequency divider 13 passes through a motor drive circuit 14, a motor 19, and a wheel train 15, and displays the normal time on the hands of a display device 16, just like a normal hand display type electronic watch. The other output signal from the frequency divider 13 is the counter circuit 1
7 and communicates signals with each other. Reference numeral 11 designates a group of external operating members including the pushbuttons 6, 7, 8, 10 shown in FIG. The counting circuit 17 is controlled by the output of the switch control circuit 18.

FIG. 3 is a main part block diagram illustrating in detail the relationship between the external operating member group 11 and the wheel train 15.

The motor drive circuit 14 drives the hour and minute hands 1a, 1a and 14 through the hour and minute wheel train 23 of the wheel train 15 in the motor 19.
1b, the hour and minute hand motor 20, and the wheel train 15.
The second hand motor 21 drives the second hand 2 via the second wheel train 24 in the second wheel train 24, and the CG2/100 second hand wheel train 2 in the wheel train 15.
The CG2/100 second hand motor 22 drives the CG2/100 second hand 5 via the CG2/100 second hand 5. Furthermore, second hand motor 2
In the CG state, the second wheel train 24 driven by 1 drives the CG minute hand 4 in addition to driving the second hand 2.
It is adapted to drive a CG minute hand train 26 and a CG hour train 27 that moves the CG hour hand 3.

In this state, by operating the external operation member group 11, the CG minute hand return mechanism 28 provided between the CG minute hand wheel train 26 and the CG minute hand 4 and the CG hour hand wheel train 27 are activated.
and the CG hour hand return mechanism 2 provided between the CG hour hand 3 and the CG hour hand 3.
9 to control the CG minute hand 4 and the CG hour hand 3.

Next, FIG. 4 is a main part block diagram showing the relationship between the external operating member group 11, the switch control circuit 18, and the counting circuit 17. The output of the reference oscillator 12, which creates a time standard, is frequency-divided and combined into an appropriate signal by a frequency divider 13, and the output signal is used by a motor drive circuit 14 to drive a second motor. Each switch provided in the external operation member group 11 is an S-S switch S ₂ 11 corresponding to the start/stop button 6.
2. R-S corresponding to set/reset button 7
It is composed of a switch S ₁ 111 and a changeover switch S ₃ 113 corresponding to the changeover button 8. The output signals of each switch are input to the switch control circuit 18, and the signals of the R-S switch S ₁ 111 and the S-S switch S ₂ 112 controlled by the switch control circuit 18 are converted into a 1-pulse signal by 1 push. , when the switch S ₃ 113 is turned on, an H level signal 193 and a 1 pulse signal 192 are emitted, and when the switch is OFF, an L level signal 193 and a 1 pulse signal are emitted.
It is controlled so that a pulse signal 192 is emitted. Counting circuit 17 is sexagesimal needle position counter 1
71, sexagesimal time counter 172, coincidence detection circuit 173, 0 detection circuit 174, RS flip-flop 175, 177, 178, D-type flip-flop 176, AND circuit 179, 180, 18
The hand position counter 171 counts the hand position of the second hand 2, and the time counter 172 counts the second time of the normal time. The coincidence detection circuit 173 is a circuit that generates an output signal when the count contents of the hand position counter 171 and the time counter 172 match, and the 0 detection circuit 174 is a circuit that detects the reset signal of the hand position counter 171 and generates an output signal. .

Next, OR gate 186 and AND gate 188,
189 constitutes a selector, and the output signal 193 of the changeover switch S ₃ 113 selects the output signal of the coincidence detection circuit 173 or the 0 detection circuit 174, and the setting of the RS flip-flop (hereinafter referred to as FF) 178 is performed. It is used as a signal.

The RSFF 175 inputs the output signal 190 of the R-S switch S ₁ 111, and the output signal becomes the input signal of the AND gate 179, and the D-type FF 17
6 uses the output signal 191 of the SS switch S ₂ 112 as an input signal, and its output becomes the input signal of the AND gate 180. and gate 179, 18
0 is controlled by the output signal 193 of the changeover switch S ₃ 113, and the output signal is controlled by the OR gate 182,
It serves as an input signal to the AND gate 185.
The RSFF 177 uses the output signal 192 of the changeover switch S ₃ 113 as an input signal, and the output signal serves as an input signal to the OR gate 182 and the AND gate 184. The AND gate 183 functions as an inhibitor of the 64 Hz signal from the frequency divider 13 using the output signal of the RSFF 178 and the output signal of the OR gate 182. The AND gate 184 is an inhibitor of the 1 Hz signal from the frequency divider 13 using the output signal of the RSFF 177, and the AND gate 185 is an inhibitor of the 1 Hz signal from the frequency divider 13 using the output signal of the AND gate 180.
It controls the Hz signal.

Next, the operation will be explained.

In the case of normal time use, selector switch S ₃ 11
3 is set to OPEN (OFF). Therefore, since the output signal 193 outputs an L level signal, an H level signal is input to one side of the AND gate 188. One hand position counter 171
Since the and time counter 172 match, the H level output signal from the match detection circuit 173 is the other input signal of the AND gate 188. Since the RSFF 177 is reset by that output signal, the RSFF 177 is Since the output signal is at the L level, the 64 Hz signal from the frequency divider 13 is inhibited by the AND gate 183, and the 1 Hz signal from the frequency divider 13 is output from the AND gate 184. The output signal of the AND gate 184 is also input to the motor drive circuit 14 to drive the second motor at 1 Hz to advance the second hand 2, and the hand position counter 171 is counted in synchronization with the advancement of the second hand 2. It's rising.

Next, push switch button 8 to switch S ₃
When 113 is turned ON, RSFF 177 is set by its output signal 192, and its output signal becomes H level. Therefore, 1Hz from frequency divider 13
Since the signal is inhibited by the AND gate 184, the output signal of the OR gate 187 becomes L level, and the 1 Hz step of the second hand 2 and the 1 Hz signal to the hand position counter 171 are stopped. Further, the output signal 192 of the changeover switch S ₃ 113 is output from the OR gate 18.
By resetting the RSFF 178 via 1, its output signal becomes L level.

Therefore, one input signal of the AND gate 183 is at H level, and the other input signal of the AND gate 183 is at H level as the output signal of the RSFF 177 is at H level as described above.
83 outputs the 64Hz signal from the frequency divider 13. The output signal is input to the motor drive circuit 14 via the OR gate 187, which drives the second motor at 64Hz to advance the second hand 2 at 64Hz, and causes the hand position counter 171 to count in synchronization with the second hand 2. rise. When the second hand 2 reaches the 0 second position and the hand position counter 171 reaches 0 seconds, the 0 detection circuit 174 operates and issues an output signal, and the H level signal from the output signal 193 of the changeover switch S ₃ 113 causes the switch to enter the standby state. The hot AND gate 189 is opened, and the output signal sets the RSFF 178 via the OR gate 186.
The output signal of the RSFF 178 becomes H level, and the AND gate 183 inhibits the 64Hz signal. This switches to chrono mode and second hand 2 is 0.
It is stopped at the seconds position.

In this state, press start/stop button 6.
When the S-S switch S ₂ 112 is turned on by pushing, the output signal 191 causes the D-type FF 176 to turn on.
The output signal of is set to H level, and the selector switch S ₃ 1
An output signal is generated from the AND gate 180 which was in a standby state by the output signal 193 of No. 13, and the AND gate 185 is opened by the output signal and a triggered 1 Hz signal is output, which drives the second motor at 1 Hz. The second hand 2 is advanced by the second wheel train 24 to display the seconds of the chronograph, and the hand position counter 171 is counted up in synchronization with the second hand 2.

Next, press start/stop button 6 again.
Push and turn on the SS switch S ₂ 112.
The output signal 191 causes the output signal of the D-type FF 176 to go to L level, and the aforementioned 1 Hz signal is inhibited by the AND gate 185, so that the second hand 2 and the hand position counter 171 are stopped. In this way, the start and stop of the chronograph display is repeated every time the start/stop button 6 is pushed once.

Here, push the set/reset button 7,
When the R-S switch S ₁ 111 is turned on, the output signal 190 of the RSFF 175 goes high.
The signal becomes high, passes through the AND gate 179, and is input to the OR gate 182, the output signal thereof becomes H level, and the input signal of the AND gate 183 also becomes H level.

The output signal 190 from the R-S switch S ₁ 111 also serves as an input signal to the OR gate 181, and the output signal from the OR gate 181 causes
Reset the D type FF176 and RSFF178.
Therefore, the output signal of the D-type FF 176 becomes L level, and since the AND gate 180 closes, its output signal also becomes L level, and the 1 Hz signal from the AND gate 185 is also stopped. At the same time, the output signal of the RSFF 178 goes to L level, so the AND gate 183 opens and the 64Hz signal from the AND gate 183 passes through the OR gate 187 and passes through the needle position counter 17.
1 is counted up in synchronization with the second hand 2.
When the needle position counter 171 becomes 0, the 0 detection circuit 174 detects 0, and the output signal from there causes the AND gate 189 to go to H level.
The RSFF 178 is set, its output signal becomes H level, and the 64Hz signal is stopped by the AND gate 183. As a result, the output signal of the OR gate 187 becomes L level, and the second hand 2 is returned to 0 seconds.

In this state, when the start/stop button 6 is further pushed and the S-S switch S ₂ 112 is turned on, the output signal 191 of the D-type FF becomes H level as described above, and the output signal from the AND gate 180 is turned on. An output signal is generated, which opens the AND gate 185, outputs a triggered 1Hz signal, and causes the second motor to run at 1Hz.
Hz, advances the second hand 2 and restarts the chronograph seconds display.

Next, press the switch button 8 in any of the above-mentioned CG start, stop, or hammer states.
When the switch S ₃ 113 is turned OFF by pushing the button, a 1-pulse H level signal is generated from the output signal 192 and passes through the OR gate 181.
Since RSFF178 is reset, RSFF178
The output becomes L level.

Therefore, the input signal to the AND gate 183 becomes H level, and 64Hz is output from the AND gate 183, and the second hand 2 and the hand position counter 171 are
Starts stepping and counting up at 64Hz. At the same time, the other output signal 193 due to the operation of the changeover switch S ₃ becomes L level, so the output of the AND gate 180 becomes L level regardless of the start/stop of the CG, in other words, regardless of the output of the D-type FF 176. level, and the 1 Hz signal of CG seconds is stopped by the AND gate 185.

And the needle position counter 171 is 64Hz as mentioned above.
The time counter 17 is counted up by
2 and the match detection circuit 173 issues an output signal, the RSFF 178 is reset by the output signal from the AND gate 188. When the output signal becomes H level, the AND gate 18
Since the input signal of 3 becomes L level, 64Hz of AND gate 183 is stopped, and AND gate 1
A 1Hz signal of the normal time is output from 84, and the second hand 2
advances as the normal time, and the hand position counter 17
1 coincides with the time counter 172 and counts up.

Also, in this state, RSFF178 is in the set state,
RSFFs 175, 178 and D-type FFs 176 have all been returned to their reset states.

As mentioned above, by each switch linked to each button on the external operation member 11, the second hand 2 displays two times, the normal time display and the chronograph time display, and the back and forth operation is performed at a fast forward rate of 64Hz. It's getting old.

FIG. 5 is a plan view of an electronic timepiece according to an embodiment of the present invention, FIG. 6 is a sectional view of essential parts of the CG minute wheel train, CG minute return mechanism, and CG hour wheel train, and FIG. The cross-sectional view of the main parts of the gear train and hourly gear train, Figure 8, is CG2/1
It is a sectional view of the main part of the 00 second gear train. Second motor 21
is composed of a second motor coil 211 shown in FIG. 6, a second motor stator 212 and a second motor rotor 213 shown in FIG. The rotation of the seconds motor rotor 213 is decelerated by the intermediate seconds wheel 240, which rotates the seconds wheel 241 to form the seconds wheel train 24, and drives the second hand 2 fixed to the seconds wheel 241 to display the seconds time. are doing.

In addition, the seconds motor rotor 213, the seconds intermediate wheel 240
Both are pivotally supported by a main plate 301 and a gear train bridge 307. The hour and minute motor 20 is composed of an hour and minute motor coil 201 shown in FIG. 6, an hour and minute motor stator 202 and an hour and minute motor rotor 203 shown in FIG. The fifth wheel 230, the center bridge 303, and the main plate 30 are
1, the fourth wheel & pinion 231 and the third wheel & pinion 232 are pivotally supported by
and a minute wheel 23 that supports the minute hand 1b shown in FIG.
3. Hinoura wheel 234, hour wheel 2 that supports the hour hand 1a
The time/minute wheel train 23 is composed of a reduction wheel train consisting of 35 and 35.

Next, in Figure 8, CG2/100 seconds motor 2
2 is CG2/100 second motor coil 221, CG2/100
Second motor stator 222, CG2/100 second rotor 22
It consists of 3, CG2/100 second rotor 223
The rotation is from the CG2/100 second intermediate wheel 252, which is pivotally supported by the chronograph bridge 306 and the main plate 301, to the CG2/100 second wheel 2.
It constitutes the CG2/100 second wheel train 25 that is transmitted to the 51. And CG2/100 second car 251 has CG2/100
The second hand 5 is supported and displays 2/100 seconds of the CG time.

In addition, the aforementioned second wheel 241 constitutes a CG minute wheel train 26 that extends from the pinion portion of the second wheel 241 through the CG minute intermediate wheel 260 to the CG minute gear 261 so as to be driven in the CG mode, and can drive the CG minute shaft 284. It's becoming like that. Furthermore, the pinion portion of the seconds wheel 24 constitutes a CG hour wheel train 27, which is the other deceleration wheel train. That is, the CG hour wheel train 2 runs from the seconds wheel 241 to the CG hour gear 273 via the CG first intermediate wheel 270, the CG second intermediate wheel 271, and the CG third intermediate wheel 272.
7 to drive the CG time axis 290.

Each of the above-mentioned CG gear trains is supported by a chronograph bridge 306 and a gear train bridge 307, and can be freely attached or detached depending on the presence or absence of the chronograph function.

As shown in FIG. 6, the CG minute wheel and hour wheel have respective return mechanisms between their gear parts and the CG minute and hour axes 284 and 290 for press-fitting the CG minute and hour hands 4 and 3. 28 and 29 (shown in FIG. 3). To explain this return mechanism in detail using the CG minute wheel, from the seconds wheel 241 to the CG minute intermediate wheel 26.
The gear train leading to the 0 and CG minute gears 261 is always the seconds wheel 24.
1 and rotates at a constant reduction ratio. CG
The minute gear 261 is press-fitted into the CG minute gear seat 283 and is loosely fitted to the CG minute shaft 284 to prevent the CG minute gear 261 from swinging relative to the shaft.

Furthermore, a heart-shaped heart cam 281 as described later is press-fitted to the CG minute shaft 284, and a slip plate spring 282 having a certain deflection is connected between the CG minute gear 261 and the heart cam 281.
is inserted. A CG minute hand cam return portion 280a of the double needle transmission lever 280 is disposed on the same surface of the heart cam 281 when viewed in cross section, and engages with the heart cam 281 by the operation of the external operating member group 11. As shown in FIG.
The CG minute hand cam return part 280a is the heart cam 28.
1, the CG minute shaft 284 rotates at a reduction ratio of 1/60 with respect to the second wheel 241.

As shown in FIG. 5, the CG minute hand cam return section 28
When 0a engages with the heart cam 281, the heart cam 281 is returned to the stable position (0 minute position) by the CG minute hand cam return portion 280a, which causes the CG minute shaft 284 to rotate and the CG minute hand 4 to also return to the 0 minute position. I will be going back. However, CG gear 261
When viewed from above, the gear train extends from the CG minute intermediate wheel 260, the seconds wheel 241, and the seconds intermediate wheel 240 to the seconds motor rotor 213.

In this case, when the heart cam is forcibly rotated, depending on the force of the slip spring 282, the CG minute axis 28
4 and the CG minute gear 261 slip, and the aforementioned speed increasing gear train does not rotate, and the CG minute gear 261 slips and the second wheel 24
This means that it is rotating in synchronization with 1. The rotation speed of the second motor rotor 213 of the second motor 21 is CG
It is decelerated by the minute gear 261, and the rotational force is conversely amplified, and the rotational force of the CG minute gear 261 is:
It is designed to be approximately 3.g-cm.

Therefore, by setting the slip plate spring 282 so that the rotational slip force between the CG gear 261 and the heart cam 281 is about 0.4 to 0.8 g-cm,
CG minute gear 2 due to forced rotation of heart cam 281
61 can be prevented from rotating. Conversely, if the rotational slip force is set to 0.4 g-cm or less, the slight unbalanced weight of the CG minute hand 4, heart cam 281, etc. will cause the CG minute gear 261 and CG minute shaft 284 to slip if an external impact such as a drop of the watch occurs. This will cause the minute hand 4 to shift.
The CG time return mechanism 29 is the same as described above.
It is composed of a time shaft 290, a heart cam 291, a slip leaf spring 292, a double-travel lever 280, and a CG time return section 280b, and its operation is exactly the same as that of the CG return mechanism 28.

In this case, the CG hour gear 273 is the CG minute gear 261.
The speed is further reduced by about 12 times, and the rotational force is 3 times
12 = about 36g-cm, slip rotation force is 0.4 ~
At 0.8 g-cm, there is no effect on the second motor 21.

As mentioned above, the CG minute and hour return mechanisms 28 and 29
is configured so that it does not affect the seconds motor 21, and when a conventional return mechanism is applied to the seconds wheel 241, the torque of the seconds wheel 241 is 3/60g-cm=0.05g.
-cm, it is extremely difficult to provide the second hand 241 with a return mechanism of 0.05 g-cm or less, and an even more complicated structure is required.However, as explained in Fig. 4, the minute hand 2 is The present invention does not require a complicated structure because the structure is such that it can be returned to zero.

Next, each of the above-mentioned switches of the external operation member group 11
The relationship between S ₁ 111, S ₂ 112, S ₃ 113 and the CG minute and time return mechanisms 28 and 29 will be explained below. 9th
The figure shows the external operation member group 11 and each return mechanism 28, 2.
9 is a plan view of the main part of the normal time display state, FIG. 10 is a plan view of the state when switching to chronograph time display by pushing the switch button 8, FIG. 11 is a plan view when the chronograph is started, and FIG. The figure is a plan view when the hammer is hammered, and FIGS. 13 and 14 are sectional views of essential parts of the external operating member group.

In the normal time mode, the Fukuteden lever 28
The 0 cam return parts 280a and 280b regulate each heart cam as described above, the CG minute and hour hands 4 and 3 are regulated at the 0 position, and the second hand 2 is regulated at 1Hz.
The hands are moving normally. Fukushinden Elever 280
is designed to rotate around a tube 301c installed in the main plate 301, and rotation is regulated by a pin 280c provided on the double-travel lever 280.
, the regulating spring part 3 provided in the chrono presser 305
05e, each heart cam 2 by pressing
81,291 is regulated to be pressed by the double-travel lever 280.

In this state, all switches S ₁ to _{S 3} are in an open state.

Next, press the switch button 8 as shown in Figure 10.
When pushed, the operating lever 120 moves to the base plate 301.
Using the pin 301b implanted in as a guide, the watch is moved toward the center of the watch.

Note that a return spring portion 305a provided in the chronograph pusher 305 always exerts a force acting on the operating lever 120 to return the operating lever 120 in the clockwise outward direction.

The operating lever 120 also includes an operating cam upper wheel 12.
A feed pawl 120a that engages with 1 is provided, and when the switching button 8 is pushed 1 time, the operating cam upper wheel 121 is moved to 1.
The teeth are designed to rotate counterclockwise. Since the operating cam upper carriage 121 is integrally connected to the operating cam lower carriage 122, the lower operating cam carriage 121 is dismounted from the main plate 30.
It rotates counterclockwise around the shaft 301a implanted in 1. The operating cam upper wheel 121 has 12 pieces, the lower gear 122 has 6 pieces, and the operating lever 120 has 12 pieces.
With one stroke, the dismount 122 rotates by 1/2 pitch. Further, an operating cam lever 123 shown by diagonal lines in FIG. 10 is always engaged with the alighting vehicle 122, and the operating cam lever 123 is rotated around a pin 301f implanted in the base plate.
Jump control spring part 305 provided in chrono pusher 305
d, so that a pressing force always acts in the direction of the center 301a of the lower gear. Switch button 8
For each push, the operating cam lower gear 122 operates so as to engage the operating cam lever 123 alternately with a peak (tooth tip), a valley (tooth bottom), a peak, and a valley.

Further, a pin 123a is implanted in the operating cam lever 123, and the position of the pin 123a is centered on the operating cam lower gear 122 with the pin 301f as the center.
It will alternately move between two locations determined by the tooth tip and tooth bottom positions. Further, a switch spring 124 that engages with the pin 123a is provided with the boss 124a as the center of rotation, and when the contact portion 124b comes into contact with the through hole pattern 304a provided on the circuit board 304, the switch S ₃ 113
is beginning to form. To explain the operation, from the normal time mode, when the switching button 8 is pushed and the operating lever 120 is made one stroke, the operating cam lower gear 122 rotates by half a pitch, and the operating cam lever 123 is at the engagement position with the lower gear 122. The pin 123 of the operating cam lever 123 changes to the tooth bottom position.
a rotates clockwise and the contact part 12 of the switch spring 124
4b is the switch pattern 304 of the circuit board 304
When it comes into contact with a, the switch S ₃ 113 turns on, and the second hand 2 stops at the 0 second position at 64Hz fast forwarding and enters chrono mode.

Next, in this state, press start/stop button 6.
When pushed, the start/stop lever 125 rotates clockwise around a shaft 301d implanted in the base plate, as shown in FIG. The start/stop lever 125 further includes a tip portion 125a that engages with the start/stop transmission lever 126 shown with diagonal lines in FIG. 11, and a chronograph pusher 305.
A tip portion 125b is provided that engages with a switch spring portion 305b provided in the switch spring portion 305b.

The above-mentioned start/stop transmission lever 126 is a lever whose rotation center is a pin 123a provided on the above-mentioned operating cam lever 123, and one end is connected to the start/stop transmission lever 12.
5 and the other end thereof are provided with portions 126a and 126b that engage with the doubling lever 280, respectively, and when the start/stop lever 125 rotates, the engaging portion 126
a is rotated counterclockwise. Further, due to the rotational operation of the engaging portion 126b at the other end, the double-travel lever 280 is rotated clockwise. By moving the cam engaging portions 280a and 280b of the double hand transmission lever 280 away from both heart cams, the CG minute and hour hands 4,
3 rotates at a constant reduction ratio with the second wheel 241.

Furthermore, the other end 125b of the start/stop lever 125
By pressing the switch spring 305b provided on the chronograph presser 305, the switch S ₂ 112 is turned on by bringing it into contact with the through hole pattern 304b provided on the circuit board 304.

Further, the start/stop lever 125 is always returned to its original state by a spring portion 127a of a lever return spring 127 provided below, and returns to its normal state when the start/stop button 6 is released. .

To explain the operation, when the start/stop button 6 is pushed in the chronograph mode, the start/stop transmission lever 12 is rotated by the rotation of the start/stop lever 125.
6, the repeating lever 280 rotates the CG minute and hour hands 4 and 3 in synchronization with the seconds wheel, and when switch S ₂ 112 is turned ON, the second hand starts 1-second interval movement, and the chronograph moves. Graph second hand 2, CG
The minute hand 4 and CG hour hand 3 will perform chronograph display.

Next, when the start/stop button 6 is pushed, only the switch S ₂ 112 operates, and the aforementioned start/stop lever 125 and start/stop transmission lever 126 operate, but the double transmission lever 280 does not engage with the aforementioned heart cam. Remains in position. This is because the pin 280c of the double needle transmission lever 280 is held by the jump control spring portion 305e of the chronograph pusher. At this time, the operation of switch S ₂ 112 brings the system into a stop state, as described above.

Furthermore, _the CG2/100 second motor 22 rotates once per second in 50 steps (2/100
(second unit) It is designed to operate with the same switch signal as the second motor 21 that drives the second wheel 112.

Next, as shown in Figure 12, regardless of whether the chronograph is starting or stopping, the
When the reset button 7 is pushed, the hammer lever 128 shown in diagonal lines in FIG.
Rotate clockwise around 01e as the rotation center. The hammer lever 128 has one end 128a that engages with the hammer transmission lever 280 and one end 128 that presses a switch spring portion 305c provided on the chronograph presser 305.
By rotating the doubling lever 280 counterclockwise with one end 128a, the heart cam 28 is press-fitted into the hour shafts 284, 290 by the cam engaging portions 280a, 280b.
1,291 will be returned to the 0 position, and the CG will be
The hour hand returns to the 0 position. Also, the hammer lever 128
At the other end 128b, the switch S ₁ 111 is turned on due to the contact between the through hole pattern 304c provided on the circuit board 304 and the switch spring portion 305a of the chronograph presser, and the second hand 2 is at the 0 position as described above in FIG. The needle will return to its original position and stop. Then push start/stop button 6
Then, when the chronograph restarts, it goes without saying that each lever operates in the same way as the start operation described above.

In addition, in chrono mode, push the start/stop button 6 and set/reset button 7.
Regardless of the operation, press switch button 8.
When pushed, one end 120b of the actuation lever 120
When the hammer lever 280 is engaged with the hammer lever 280, the hammer lever 280 is rotated in the same way as the hammer lever 128 is rotated counterclockwise.
If the hour hands 4 and 3 are not homered to the 0 position during chronograph operation, they are made to be homed.

Furthermore, the upper and lower gears 121 and 122 of the operating cam are rotated by the feed pawl 120a of the operating lever 120, and the operating cam lever 123 is returned to the tooth bottom position of the lower gear 122 of the operating cam, so that the pin 123a of the operating cam lever returns to its original position as described above. The switch spring 124 returns to the normal time mode position and the switch S ₃ 1
13 is turned OFF, and the second hand 2 returns to the normal time at a fast forward rate of 64 Hz and moves by one second.

When switch S ₃ 113 is OFF, press start/stop button 6 as shown in Figure 9.
Even if you push and rotate the start/stop lever 125,
One end 125a thereof is connected to one end 12 of the start/stop transmission lever.
6a, and the start/stop transmission lever 126 and the hammer transmission lever 280 do not operate. In this case, only the switch S ₂ 112 operates, and is designed to serve as a start/stop signal for the timer.

Similarly, when the switch S ₃ 113 is OFF, even if the set/reset button 7 is pushed and the hammer lever 128 is rotated, the hammer transmission lever 28
0 and its engaging portion 128a are connected to the double-travel lever 28.
0 is already at the heart cam pressing position, which is the normal time mode position, so it does not engage. In this case, the switch S ₁ 111 operates, and depending on whether it is 1 push or continuous push, the timer is set in 1 minute increments or by continuous movement.
The timer time is set by rotating the CG2/100 second hand 5.

Also, push the set/reset button 7 to set the CG
Even if the 2/100 second hand 5 is advanced, it will not operate as a timer unless the start/stop button 6 is pushed, making it possible to use it as a simple 50-decimal counting device.

When the timer is not started only by setting the timer,
Also, regardless of whether or not the timer is starting, if you push switch button 8 to switch to chrono mode,
As with second hand 2, the timer time is canceled.
The CG2/100 second hand 5 returns to the 0 position and prioritizes the chrono mode.Push the switch button 8 twice to cancel the timer in the middle of the timer, and change from chrono mode (timer cancel) to normal mode (timer mode). By doing so, it can be used as a zero reset for a timer or a counting device.

Regarding the alarm structure, there is a reuse position selection switch provided on the reuse 9 and the winding stem 90, etc.
A selection switch for the reuse rotation direction and number, an alarm ON/OFF button 10, and an ON/OFF switch provided on the switch winding stem 100 are provided between the main plate 301 and the circuit board 304 on the upper side of FIG.
Based on the switch signal, settings of the reference time, normal time, and reference time are performed by the hour/minute motor 20, the hour/minute wheel train 23, and the hour/minute hands 1a, b.

According to the above embodiment, the second hand uses electrical zero return, so the mechanical structure is not complicated, and the normal hour and minute hand motor is used only for the hour and minute hands, so the hand can be moved in 1-second steps like a second hand. Not 20
It is possible to move seconds and 30 seconds, and the hour and minute hands can be operated at relatively high speeds.Alarm time and other two-time displays can be switched in a single time display using a pointer monitor, so it is multifunctional. It can be said that it is also very effective. Furthermore, it is now possible to use the CG2/100 second hand as a timer display and use the switches and levers around the chronograph.

Whether the second display is a normal time or a chronograph time display, it is placed in the same center of the watch, so the second display of the normal time can be used very easily even when used for sports or the like.

You can also operate the start/stop button, set/
Since the chronograph and timer can be used only by the reset button, and the alarm can be operated only by reusing, for example, it is very easy to set and check the alarm, use the timer and alarm together, etc. even while using the chronograph.

〔Effect of the invention〕

As is clear from the above embodiments, according to the present invention, it is possible to display normal seconds and chronograph seconds, minutes, hours, etc. with only one motor for the second hand, and the number of motors can be reduced. The chronograph hammer mechanism is electrically operated for the seconds axis, which has less rotational torque, to simplify the mechanical structure, and is mechanically operated for at least the minute axis of the chronograph, which has a greater rotational torque to be decelerated. As a result, it is possible to instantaneously return to zero, and to make the needle return to zero using a relatively simple return structure. In addition, since the minute and hour hands of the chronograph move in 1-second steps from the seconds axis, it is possible for the user to read the minutes in analog fashion, making it a very practical chronograph. We can provide clocks with graphs.

[Brief explanation of drawings]

FIG. 1 is an external view of a timepiece according to the present invention, FIG. 2 is a block diagram of essential parts of a timepiece system according to the present invention, FIG. 3 is a block diagram of a gear train configuration according to the present invention, and FIG. 4 is a circuit according to an embodiment of the present invention. A block diagram, FIG. 5 is a plan view of the main parts of a watch according to an embodiment of the present invention, and FIGS. 6 to 8 are sectional views of main parts of each wheel train according to an embodiment of the present invention, and
Figure 12 is a switch and chronograph lever operation diagram according to an embodiment of the present invention, and Figures 13 and 14 are diagrams of 9-1.
FIG. 2 is a sectional view of a main part of FIG. 2; 11... External operation member group, 15... Wheel train, 17
...Counting circuit.

Claims (1)

[Claims] 1. A reference oscillator, a frequency divider that divides the output signal from the reference oscillator, a motor drive circuit that outputs a signal for driving the motor using the output signal from the frequency divider, and an output signal from the motor drive circuit. A motor for electrical-to-mechanical conversion, a gear train for transmitting the rotation of the motor, and a counting circuit for measuring time information based on the signal of the frequency divider,
In an electronic timepiece that displays hands by switching between two times, normal time and chronograph time, by controlling the counting circuit with an external operating member, the chronograph time wheel train includes a seconds wheel, a deceleration wheel train, and the wheel train. It consists of a minute car and more, which are decelerated through
An isolation mechanism is provided in the reduction gear train leading from the seconds wheel to the minutes wheel to separate the rotation of the seconds wheel and the minutes wheel, and the zero return of the chronograph pointer is controlled by the seconds wheel controlled by the external operating member. An electronic timepiece with a chronograph, characterized in that the minute wheel is controlled by an electrical signal from a circuit, and the minute wheel is controlled by a mechanical zero return mechanism provided in the wheel train.